i keep debating if i should take my Injen SES off, and install the Nismo???? i heard the nismo (with stock cats) at my dealer the other day, and it sounded serously weak (no offence) compared to my injen w/o cats. WAY to quiet for me! im sure the nismo w/o cats would come to life some though. has anyone heard both exhausts w/o cats "in person"? could you give me a comparison please? a friend of mine ended up buying the nismo equipped Z from the dealer! if nothing else, ill get to hear his after he takes his cats out

 

Jack... one of the cats from Lexington, came down and had the headers and cats put on...

With his NISMO exhaust... I was like .

It was NOT quiet.

 

the one i heard had JUST been installed. i mean i heard it the first time it was started with it on. they did the nismo intake as well. does the exhaust get any louder over time? if anything, i thought it got quieter? but i PROMISE the headers made a BIG difference in sound!! what headers were they running??

 

Well, I will have my car back tuesday with the nismo exhaust on it. So I can not comment until then. I also am waiting for my Kinetix cats to come in...

 

This is the "Jack" in Lexington mentioned above. After installing the Nismo exhaust, I had Doug @ CrawfordZ do my headers, cats & as of Friday, the performance plenum.

With just the Nismo exhaust, the tone became a lower, deeper growl - I loved it! It's funny, to some it's too soft...to some too loud - just goes to show difference of opinions. There was a difference however, especially at 4k+ RPM. At idle it sounded stock.

After the headers & cats were installed, the exhaust woke up - ha! I mean REALLY woke up & the sound now is pretty impressive (remember difference of opinions however). I would have to say it is loud - at idle, pretty tame, but when you get it on, the thing screams - it definitely lets you know something's been done to the exhaust - ha! After the plenum was installed Fri. I didn't notice any change with the sound at the rear, but the engine now has a difference sound to it - I can really hear the air being sucked in now - a sweet sound to me!

And after we removed the rubber winter floor mat that was unknowingly keeping the gas pedal from going to WOT by about 3/4" the Z really goes now - haha!! A fuuny story in itself.

 

if you want it louder, why would you take off the injen? lighter, and shown more power gains. its only drawback is its volume.

I dont see the purpose, or maybe I missed it.

 

I think NISMO exhaust rated the lowest net rwhp gains out of all aftermarket exhaust, injen was first then borla. I have borla cause it sounds nice and looks great and performs good. Just like the nismo exhaust only gives you a few more rwhp. Dosent really matter all aftermarket exhuast do virtually nothing untill you strap on some headers and Test pipes and F/I.........